Mass beer openers

I'd like to return for a moment to my list of beer openers, and add two extra ones. Their common thing is opening beer on a sort of large scale.

The first one lets you open 20 beers at once. It can come in hand when you organize a huge frat party. Am I right?

The second one (via NotCot) helps you open beer when no other bottle opener is nearby. It is attached to 4-pack packaging. Pretty neat, don't you think.